Nairobi, Kenya (CNN) — A number of Kenya‘s Cabinet members and defense officials were warned about the possibility that the terror group Al-Shabaab was planning to carry out a Westgate-style attack a year before gunman stormed the Nairobi mall, according to several police and intelligence sources.

CNN has seen an electronic version of those reports, which contain an extensive list of terror threats from several regions across Kenya over an extended period, but they also specify Al-Shabaab posed a threat to several targets, including Westgate Shopping Mall.

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CNN has also learned that the Westgate mall attackers tortured some of the hostages.

Military doctors said militants severed hands, cut off noses and, in some cases, hanged hostages. CNN has seen photographic evidence of one dead victim with a hand amputated.